US3779386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cartridge
Assignee: Ecodyne Corp
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Filing: 1972-03-23
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Granted: 1973-12-18
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Expires: 1992-03-23
Abstract
Abstract An improved precoat filter cartridge and a method of applying the precoat medium thereto. The filter cartridge comprises: a vertically extending tubular core element having apertures therein; a filter screen positioned about said core element to receive precoat particles; and a cover member closing off the upper portion of said core element defining a chamber formed by the sides thereof to accumulate gas trapped within said cartridge. A vent hole is provided in said cover member to permit the trapped gas to be vented therethrough.
Inventors
- 👤 L Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:01
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/50; B01D29/52; B01D29/11; B01D29/13; B01D29/15; B01D36/00; B01D36/001; B01D37/00; B01D37/02; B01J; B01J47/00; B01J47/12; B01J47/133; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
160 words
In a liquid filtering apparatus including a filter tank, a plate separating said tank into an upper influent compartment and a lower filtrate compartment, a plurality of annular filter cartridges vertically mounted in said influent compartment, and precoat means including means for distributing precoat particles on said filter cartridges; each of said filter cartridges comprising: a. a vertically extending tubular core element having apertuRes therin; b. a filter screen positioned about said core element to receive said precoat particles; and c. cover member means closing off the upper portion of said core element defining a chamber having substantially imperforate walls formed by the sides thereof in direct and free communication with said filter cartridge interior for accumulating gas trapped within said filter cartridge upon increase of the liquid pressure within said tank in an area remote from the filtering area of said filter cartridge so as to permit said precoat to deposit on said filtering area in a uniform layer.
Claim 2
Dependent Claim
160 words
In a liquid filtering apparatus including a filter tank, a plate separating said tank into an upper influent compartment and a lower filtrate compartment, a plurality of annular filter cartridges vertically mounted in said influent compartment, and precoat means including means for distributing precoat particles on said filter cartridges; each of said filter cartridges comprising: a. a vertically extending tubular core element having apertuRes therin; b. a filter screen positioned about said core element to receive said precoat particles; and c. cover member means closing off the upper portion of said core element defining a chamber having substantially imperforate walls formed by the sides thereof in direct and free communication with said filter cartridge interior for accumulating gas trapped within said filter cartridge upon increase of the liquid pressure within said tank in an area remote from the filtering area of said filter cartridge so as to permit said precoat to deposit on said filtering area in a uniform layer.
Claim 3
Dependent Claim
31 words
The precoat filter cartridge as defined in claim 1 wherein said cover memeber means includes a vent hole passing therethrough so as to permit said trapped gas to be vented therethrough.
Claim 4
Dependent Claim
17 words
The precoat filter cartridge as defined in claim 2 wherein said filter screen covers said vent hole.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |